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Exactly as mark said. Either put up with dew or not. Obviously a dew shield helps but this will only work so far.
The straps are supposed to be mounted on the OTA tube, just behind the lens cell (not on the dew shield) as the energy they give off is re-radiated as IR heat energy from the OTA ...heating the optics slightly.
Although Kendrick have a range of heated dew shields...don't know how that works!
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